fix(ci): pin DOCKER_API_VERSION=1.43 for e2e job

The runner's Docker client negotiates API 1.53 but the daemon on the
NAS only supports up to 1.43. Pin the version for all docker commands
in the e2e job, including the new network connect step.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -92,6 +92,7 @@ jobs:
 
     # These env vars are picked up by docker-compose (overrides .env file)
     env:
+      DOCKER_API_VERSION: "1.43"
       POSTGRES_USER: archive_user
       POSTGRES_PASSWORD: ci_db_password
       POSTGRES_DB: family_archive_db